json-ld playground Error thing definition ontology/schema

[unit9a]

json-ld source: https://www.w3.org/2022/wot/td/v1.1

json-ld playground permalink

console error:
message: "Cannot read properties of undefined (reading 'forEach')"

stack: "TypeError: Cannot read properties of undefined (reading 'forEach')\n at Object.jsonldVis (https://json-ld.org/playground/jsonld-vis.js:47:19)\n at playground.performAction.options.format (https://json-ld.org/playground/playground.js:971:12)\n at new Promise ()\n at Object.performAction (https://json-ld.org/playground/playground.js:969:14)\n at Object. (https://json-ld.org/playground/playground.js:1279:23)\n at playground.tabSelected (https://json-ld.org/playground/playground.js:907:23)\n at HTMLAnchorElement.dispatch (https://cdn.jsdelivr.net/g/[email protected],[email protected],[email protected],[email protected],[email protected](codemirror.min.js+addon/lint/lint.js+addon/edit/matchbrackets.js+addon/edit/closebrackets.js+addon/display/placeholder.js+addon/hint/show-hint.js+mode/ntriples/ntriples.js+mode/javascript/javascript.js):1266:8066)\n at HTMLAnchorElement. (https://cdn.jsdelivr.net/g/[email protected],[email protected],[email protected],[email protected],[email protected](codemirror.min.js+addon/lint/lint.js+addon/edit/matchbrackets.js+addon/edit/closebrackets.js+addon/display/placeholder.js+addon/hint/show-hint.js+mode/ntriples/ntriples.js+mode/javascript/javascript.js):1266:4767)\n at Object.trigger (https://cdn.jsdelivr.net/g/[email protected],[email protected],[email protected],[email protected],[email protected](codemirror.min.js+addon/lint/lint.js+addon/edit/matchbrackets.js+addon/edit/closebrackets.js+addon/display/placeholder.js+addon/hint/show-hint.js+mode/ntriples/ntriples.js+mode/javascript/javascript.js):1266:7167)\n at HTMLAnchorElement. (https://cdn.jsdelivr.net/g/[email protected],[email protected],[email protected],[email protected],[email protected](codemirror.min.js+addon/lint/lint.js+addon/edit/matchbrackets.js+addon/edit/closebrackets.js+addon/display/placeholder.js+addon/hint/show-hint.js+mode/ntriples/ntriples.js+mode/javascript/javascript.js):1266:14925)"